Respiratory System Quiz

What is the primary function of the respiratory system as described in the text?

• To transport nutrients to the cells

• To move oxygen from the outside environment into the body and remove carbon dioxide and water

• To aid in the digestion of food

• To circulate blood through the body

Which structures do air pass through as it travels from the outside environment to the lungs?

• Esophagus, stomach, and small intestine

• Nose, pharynx, trachea, and bronchi

• Heart, veins, and arteries

• Kidneys, liver, and pancreas

What happens in the alveoli during gas exchange?

• Nutrients are absorbed into the blood

• Oxygen passes through the wall of the alveolus and carbon dioxide and water pass from the blood into the alveoli

• Blood is pumped back to the heart

• Hormones are released into the body

What role does the diaphragm play in the respiratory system?

• It filters the air entering the lungs

• It aids in the digestion of food

• It helps in the circulation of blood

• It causes air to flow in or out of the lungs by expanding or contracting

Where is the larynx located, and what is its function in the respiratory system?

• At the base of the throat; it helps in swallowing food

• At the top of the trachea; it contains vocal cords that vibrate to produce sound

• In the chest cavity; it regulates the flow of air into the lungs

• Below the lungs; it filters out impurities from the air

What is the first part of the respiratory system that air enters during breathing?

• Lungs

• Mouth

• Nose

• Pharynx

After the nose, where does the air travel next in the respiratory system?

• Lungs

• Pharynx

• Trachea

• Bronchi

Which statement is true about the air you breathe?

• The air you breathe is part of the Earth’s atmosphere, the blanket of gases that surrounds Earth.

• Oxygen makes up about 50 percent of the gases in the atmosphere.

• Your body uses only a part of the air that you breathe into your lungs.

• Most of the air you breathe in stays inside your body.

What percentage of the gases in the atmosphere is made up of oxygen?

• 21 percent

• 78 percent

• 50 percent

• 10 percent

What happens to the air you breathe after it is used by your body?

• It is stored in the lungs permanently.

• It is converted entirely into carbon dioxide.

• Most of it goes back into the atmosphere when you exhale.

• It remains unchanged and is used repeatedly.